TNC reflects on how fighting evolved from a necessity in his adolescence to a liability in his adulthood:
If you are a young person living in an environment where violence is frequent and random, the willingness to meet any hint of violence with yet more violence is a shield. Some people take to this lesson easier than others. As a kid, I hated fighting--not simply the incurring of pain, but the actual dishing it out. (If you follow my style of argument, you can actually see that that's still true.) But once I learned the lesson, once I was acculturated to the notion that often the quickest way to forestall more fighting, is to fight, I was a believer. And maybe it's wrong to say this, but it made my the rest of my time in Baltimore a lot easier, because the willingness to fight isn't just about yourself, it's a signal to your peer group.
I think one can safely call that an element of a kind of street culture. It's also an element which--once one leaves the streets--is a great impediment. "I ain't no punk" may shield you from neighborhood violence. But it can not shield you from algebra, when your teacher tries to correct you. It can not shield you from losing hours, when your supervisor corrects your work. And it would not have shielded me from unemployment, after I cold-cocked a guy over a blog post.
(Video from an unsettling series of clips compiled by Choire, who declares high schools "hotbeds of people beating each other up and other people filming them on their phones.")